Dell PowerVault MD3420 - Manual (Page 166)

Parameter Description
physicalDiskType The type of physical disk that you want to use in the virtual disk.
You cannot mix physical disk types. The valid physical disk type is
SAS. You must specify a physical disk type.
capacity The size of the virtual disk that you are adding to the storage
array. Size is defined in units of bytes, KB, MB, GB, or TB. The
following examples show the syntax:
capacity=500 bytes
capacity=2 GB
NOTE: A space must be added between the last digit and the
size (bytes, KB, MB, or GB) for values greater than 9. If you
do not specify a capacity, all the available physical disk
capacity in the disk group is used. If you do not specify the
capacity unit, bytes is used as the default unit.
owner The setting for which RAID controller module owns the disk
group. Valid RAID controller module identifier values are 0 and 1.
The identifier value is 0 for the RAID controller module on the top
and 1 for the RAID controller module on the bottom when
viewed from the rear of the enclosure. If you do not specify an
owner, the RAID controller module firmware determines the
owner.
cacheReadPrefetch The setting to turn on or turn off cache read prefetch. To turn off
cache read prefetch, set this parameter to FALSE. To turn on
cache read prefetch, set this parameter to TRUE.
segmentSize The amount of data (in KB) that the RAID controller module
writes on a single physical disk in a virtual disk before writing data
on the next physical disk. Valid values are 8, 16, 32, 64, 128, 256,
or 512.
usageHint The setting for both the cacheReadPrefetch parameter and
the segmentSize parameter to be default values. The default
values are based on the typical I/O usage pattern of the
application that is using the virtual disk. Valid values are
fileSystem, dataBase, or multiMedia.
enclosureLossProtect The setting to enforce enclosure loss protection when you create
the disk group. To enforce enclosure loss protection, set this
parameter to TRUE. The default value is FALSE.
drawerLossProtect The setting to enforce drawer loss protection when you create
the disk group. To enforce drawer loss protection, set this
parameter to TRUE. The default value is FALSE.
securityType The setting to specify the security level when creating the disk
groups and all associated virtual disks.
• none—The disk group and virtual disks are not secure.
• capable—The disk group and virtual disks are capable of
having security set, but security has not been enabled.
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